Magnesium Composite Materials for Nickel–Metal Hydride Batteries

Amorphous MgNi and MgNi0.5Co0.5 composites were prepared by mechanical ball grinding in an argon atmosphere. The electrodes made of these composites are characterized by high electrochemical discharge capacity: 872 mA · h/g for MgNi and 309 mA · h/g for MgNi0.5Co0.5. The cyclic stability (S30) of the MgNi0.5Co0.5 electrode (42%) is somewhat higher compared to MgNi (26%). Reduction in the capacity of electrodes is associated with bulk and corrosion processes. The MgNi0.5Co0.5 electrode increases its capacity to a greater extent than MgNi after deep discharge.